Ensures a comfortable running experience on asphalt

The Glycerin GTS 21 features:

• Engineered wrap knit uppers is breathable and allows for a flexible, accommodating fit while staying soft against your foot
• Nitrogen-infused DNA LOFT v3 to maximize softness
• The innovative GuideRails? technology supports your body in its natural motion path while keeping excess movement in check

Sturdy upper for support